murphy



May 17 1927.

J. J. MURPHY y CYLINDER Loox Filed Jan. 19. 1926 &.

Patented May 17, 1927.

UNIT- ED STAT PATENT g Jnxvrnsa. MURPHY, or TnnnYvrLLn, oonnnorronrfnssIe-Non To nnennnoon A orf'rnnRYvrnLn, conuno'rrcnrgn oonronAT'IoN.

CYLINDER LOCK.

Application filed January 19, 192e. serial No. sacas.k

Fig. 3 is a detached, persective View ,oftV

the `cylinder-unit.

Fig. 4r is a corresponding view ot the housing-unit.

Fig. 5 is a` detached view of one ot thev locking-pins. v

My invention relates to an improvenient in that class of cylinder locks known in the trade as night-latches,7 the object being to provide such a lock-mechanism with simple and effective, jiinniyproot means, whereby the lock is prevented troni being 'forced by the surreptitious bodily rotation of its cylinder `trom the exposed front end thereof.

lllith these ends in view, my invention consists in a cylinder loclr characterized by being constructed and adapted to receive locking-means for insertion from the rear ot the lock, betweenthe cylinder and the housing thereof, whereby the cylinder is prevented trom being bodily rotated from its exposed tront end, after the installation oi' the lock.

irly invention further consists in a cylinder lock charsuterized by having .its enter nally-threaded cylinder provided With one or more longitudinal grooves, and also by having its internally-threaded housing provided with one or more similar longitudinal `grooves, the said grooves in the cylinder and housing being spaced apart, so that, When brought into registration, they Will receive locking-pins, by which the cylinder' and housing are positively held against relative rotation after the installation ol? the lock.

My invention further consists in a lock ot the character described, having certain further details of construction and combinations of parts as Will be hereinafter described and pointed out in the claims.

In carrying out my invention, as herein shovvn, I employ a standard cylinderY loc/lr having a cylinder-unit l0 and a housingor sleeve-unit 11 of any approved construction. At Aits iforivard end, 'the cvlinder-unit is formed'with an annular flange 12 which,`

when the lock is installed, sets into an ordinary annular escutcheon 13.

Thesaid cylinder-unit 10 is for1ned`-\vitli externaly threads 111, adapting itA to be screwed into the corresponding internal threads 15 oit the housing-unit 11 inthe usual manner.

. As shown, the external threads llof the dinal, semi-cylindrical grooves lov entering itxfrom its inner end, yWhile the internal threads 15 of the housing-unit are intersected by two corresponding, semi-cylindrical grooves 17 extending into it fromv its inner end, which is furnished, as shown, with a mounting-flange 18 having screvv-holes 19 for the reception ot' screws 20, by Which the housing-unit is secured 'to the inner vtace of the door 21, which is formed with a transverse bore 22 to receive it.

The grooves 16 of the cylinder-unit and the grooves 17 of the housing-unit are similarly spaced apart, so that, when brought into registration, they 'together form substantially round openings just large enough ior the reception of removable locking-pins 23, bent at a right angle at their rear ends to form stop-arms 24 When-inserted into the said grooves, the pins 23 then lying substain tially half Within the cylinder-unit and halt Within the housing-unit, and positively preventing' the same from relative rotation, should an attempt be made to forcibly rotate the cylinder from the outside ofthe door by applying a pipe-Wrench or any other effective tool to the annular fiange 12 of the cylinder for the rotation ot' the same, and hence the operation ot' the latch-unit through the bar l26, which couples the latch` unit with the cylinder-unit.

ln installing u lock constructed in accordance with my invention, the cylindersunit and the housingainit are inserted into the bore 22 ot' the. door 21 from the opposite sides thereof and screwed together, so that the grooves 14; in one part are aligned with the grooves 15 of the other part, atter which the locking-pins 23 are inserted into these registered. grooves from the rear tace ot the housing-unit, the flange 18 ot which isV nonv secured to the door by the screws 20, wherebythe housingand cylind-er-units are held against relative rotation in thexbore 22 ot the doorf-the housi1'igunit by the screws 2O and the cylinder-unit by the locking-pins 23,

The number of grooves in the units may k cylinder-unit are intersectedby two longituf two or more.

for insertion into a door from the outside thereof, fof an internallvthre'aded 'housingnnit for insertion into the (lo'orfrom the inside thereof, to Whicliit is secured, whereby the twofunits are extensihlv connected and installed in the door against longitudinal movement in either direction, and means concurrent-ly engaging` Withthe said units for preventing their rela-tive rotation in the door, the seid means n being insertahle from the rear end of the locking-unitthe combination 2. In a cylinder-lock, the combination with an externally-threaded cylindeifunit for insertion into .the door froinvthe' outside'thereof, of an internally-threaded housing-unit for insertion intothe door from the inside thereof,`the said housing-unit being provided with a flange by means of which it is attachedrto the inside ot the door, whereby the two units are extensibly connected and installed in the door against longitudinal movement in either direction, and means for preventing the relative rotation lot'the said units Withinthe door, the said i'neans being inserted through the inner end ol thehousing-unit to concurrently engage `with the internal periphery thereo't'and the external periphery' vof the cylinder-unit.

`In testimony whereof, I have `signe'd'this specification. v

JAMES J. MURPHY. 

